What does code P0300 mean on a Volvo and is it safe to drive?
P0300: Random/Multiple Cylinder Misfire Detected. Here's what it means on your Volvo, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
The PCM has detected misfires across multiple cylinders. This can cause damage to the catalytic converter if driven for long.
Common causes for your Volvo
- Worn spark plugs or ignition coils
- Clogged or bad fuel injectors
- Low compression
- Vacuum leak, bad MAF, or fuel delivery issue
Symptoms
- Check Engine Light (often flashing under load)
- Rough idle, shaking, loss of power
- Possible smell of unburned fuel
Typical fixes
- Replace spark plugs and coils as needed
- Clean or replace fuel injectors
- Fix vacuum/fuel issues
- Compression test if no obvious cause
Repair cost range
For a Volvo, repairs for P0300 often fall between $150 and $1200, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Volvo
Volvo P0300 on B5254T T5 five-cylinder engines—earlier models (pre-2007) use a single coil cassette covering all five cylinders; cassette failure results in P0300 across all cylinders. Replace the entire cassette as a unit. On 2007+ T5 models with individual coil-on-plug design, individual coil failures are more common. On B5254T2 and B5254T9 engines, P0300 following oil consumption indicates worn piston rings; Volvo had a piston ring replacement program on some affected B5254 engines.
Most commonly affected models